I bought a used Iron Cobra double pedal online and not knowing the age of the pedals, decided to upgrade the springs. I tend to play with my springs on the tighter side so I gave these springs a try after reading the description.They are huge! Much fatter than the stock Tama spring. I installed them, which is a pain btw, and gave them a try and felt they were way too stiff right away. I also have a single Iron Cobra with a stock spring and played them side by side with the same tension and the stock spring is so much faster and smoother. I also just replaced the springs on my DW 5000 so I know this isn't a "breaking them in" type of issue.These heavy duta Tama springs are just too stiff for me. I'll be replacing these with the DW springs. If you have a very heavy foot and just play rock, these may be for you. But if you play double bass and want any sort of speed, I would stay away.

The springs are easy to install. I have heavy legs, so this spring is a little light for me. I like to strike a little harder than most, and this spring's recoil is just a tad slow for me, but should be more than good for a beginner.

Offers more control at higher speeds than conventional springs, so that spot that you have when you scoot your foot back at higher speeds to keep constant speed is up farther. In other words, you can just overall go faster.